Concrete-reinforcing bar.



E. CANNES.

Patented June 22, 1909.

U /W u f ELIE CANNES, OF NEW YORK, N. Y.

CONGRETE-REINFORCING- BAR.

Specification of Letters Patent.

Application filed November 13, 1908.

Patented June 22, 1909.

Serial No. 462,490.

To all whom 'it may concern:

Be it known that I, ELIE Cannes, a citizen of the United States, residing at New York, in the borough of Manhattan, State of New York, have invented new and useful Improvements in Concrete-Reinforcing Bars, of which the following is a specification.

lil vinvention relates to metallic bars for reinforcing concrete, and has fill" its object to provide an improved metal bar to be cmbcdded in the concrete. which shall have a series of depressions therein to engage with the surrounding concrete, and which shall be uniform in cross area at all points in its length.

In the accompanying drawing: Figure 1 is a perspective view of a portion of my improved bar. Fig. 2 is an elevation of the same. -I ig. 3 is a central longitudinal sectional view of the same. Fig. 4 is a trans. verse sectional View of the same.

Similar numerals of reference denote cor responding parts in the several views.

In the said drawing the reference numeral 1 denotes my improved bar, which is substantially rectangular in cross area, and which may be of any desired length and of any cross area. The mean cross area of said .bar lies in planes extending between the lines 2. The surface of said bar, however, is regularly interrupted by alternate depressions 3 and projections st, said depressions 3 having the form of a triangular prism, whilesaid/projections 4 are rectangular, as shown. It will be observed that the entire surface of the bar is provided with these depressions and projections, and that the depressions and projections alternate on the sides of the bar at right angles to each other, so that a cross section taken at any point will strike 0 positely disposed depressions and opposite y disposed projections. I form the depressions 3 of a de th at their centers 5 double the height of t e projections 4 from the planes of the lines 2, the result being that the areas of each of said depressions 3 is exactly equal to that of one of the projections 4, so that as a cross'section' taken at any point will pass through two depressions 3 and two pro ections t, the cross area of the bar at all points in its lengthwill be the same. Thus, if the distance between the lines 2 was one inch, the cross area of the bar would be one square inch, the amount lost at any point by the depressions 3 being exactly compensated for by the projections l, the only object of said projections being to compensate for this loss, as the depressions alone are to make the bond between the concrete and the bar.

As shown, I prefer to incline the transverse walls (3 of the depressions 3, in order that there may be a better connection betwecn the depressed and projected parts.

It is-well known that under the repeated and prolonged action of loads a reinforced concrete bar has a tendency to work loose therein, owing to the destruction of the natural adhesion. By forming the depressions 3 of the form of :1V triangular prism, whereby their depth is increased, this tendency of the bar to work loose in the concrete- .is more effectually prevented.

,having its surfaces formed with depressions having the form of a triangular prism and with' rectangular projections, said depressions and projections being arranged alternately throughout the bar and being of equal area in cross section.

2. An angular concrete reinforcing bar, having its surfaces formed with depressions having the form of a triangular prism and with rectangular projections, sald depres sions and projections being arranged alternately throughout the bar, and the depth of the depressions at their deepest point being twice the depth of the projections, whereby the areas of said depressions and projections shall be equal.

3. An angular concrete reinforcing bar, having its surfaces formed with depressions having the form of a triangular prism and with rectangular projections, said depressions and projections being arranged alternately throughout the bar, the depth of the depressions at their deepest point being twice the depth of the projections, whereby the cross areas of said depressions and projections shall be equal.

i. A concrete reinforcing bar, substantially rectangular, and formed "of a plurality of units oblong in cross area, each of said units embodying in its oppositely disposed longer sides depressions having the form of a triangular prism and extending from end to end ofsaid unit, the shorter sides of said unit being fiat, said units being united end to end with said depressions alternately disposed.

5. A concrete reinforcing bar, substantially rectangular, and formed of a plurality of units, each of said units embodying in oppositely disposed sides depressions having the form of a triangular prism and extending from end to end of said unit, said depressio s terminating crosswise on each side a distafice from the edges of the sides equal to one half the depth of said depressions, the other sides of said unitbeing Hat, and said units being united end to end with said depressions alternately disposed.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

Wit

ELIE CANNES. 

